Engineering Board Exam Reviewer · Series-Parallel Circuits · medium

The Wheatstone bridge shown is balanced (no current flows through R5, the detector). V=24 V, R1=20, , R2=60, , R3=30, , and R5=200, . Find R4.

  1. 10,
  2. 40,
  3. 50,
  4. 90,

Answer

D. 90,

Solution

A balanced bridge satisfies R1/R3=R2/R4, so R4=R2R3/R1=(60, )(30, )/20, =90, .

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